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最近閑來獨自搞了個app上架，目前還在審核， 該應(yīng)用在很多場景下都用了自定義的彈出視圖，所有抽空把它抽出來做成一個單獨 PopupView 控件，已經(jīng)放在github，支持cocoapods了，歡迎 star，哈哈，這都是閑話，主要是控件涉及界面相關(guān)的內(nèi)容，平常都用習(xí)慣了 Masonry 了，再加上自己畢業(yè)后就開始寫SDK，界面寫得還真的不多，控件開源出去就不方便用 Masonry 了，只能用原生的了。

作為一名程序猿，不懂不恥，現(xiàn)學(xué)現(xiàn)賣 ^_

先看 UIViewAutoresizing 內(nèi)容：

typedef NS_OPTIONS(NSUInteger, UIViewAutoresizing) {
    UIViewAutoresizingNone                 = 0,
    UIViewAutoresizingFlexibleLeftMargin   = 1 << 0,
    UIViewAutoresizingFlexibleWidth        = 1 << 1,
    UIViewAutoresizingFlexibleRightMargin  = 1 << 2,
    UIViewAutoresizingFlexibleTopMargin    = 1 << 3,
    UIViewAutoresizingFlexibleHeight       = 1 << 4,
    UIViewAutoresizingFlexibleBottomMargin = 1 << 5
};

• UIViewAutoresizingNone：就是不改變大小，不解釋
• UIViewAutoresizingFlexibleLeftMargin：調(diào)整與父視圖左邊距，保證右邊距不變

這個就是相當(dāng)于寬度固定時，Masonry 中：

make.right.mas_equalTo(weakSelf.view.mas_left).offset(-OFFSET);

• UIViewAutoresizingFlexibleRightMargin: 調(diào)整與父視圖右邊距，保證左邊距不變，和UIViewAutoresizingFlexibleLeftMargin 正好相反
• UIViewAutoresizingFlexibleWidth：就是上面兩個的結(jié)合體，左右邊距不變，改變大小適應(yīng)， 相當(dāng)于：

UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin

注意，可以通過 | 結(jié)合多個條件來完成所要的效果。

下面就不啰嗦了：

• UIViewAutoresizingFlexibleTopMargin：下邊距不變，上邊距適應(yīng)
• UIViewAutoresizingFlexibleBottomMargin：和UIViewAutoresizingFlexibleTopMargin相反
• UIViewAutoresizingFlexibleHeight：

UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin

這里就不過多閑話了，demo 源碼直接貼出：

@interface ViewController ()
@property(nonatomic, strong) UIView *subview1;
@property(nonatomic, strong) UIView *subview2;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self prepareSubview];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

#pragma mark - prepare method
- (void)prepareSubview {
    [self.view addSubview:self.subview1];
    self.subview2.autoresizingMask = UIViewAutoresizingFlexibleTopMargin;
    [self.subview1 addSubview:self.subview2];
}

#pragma mark - setter
- (UIView *)subview1 {
    if (!_subview1) {
        _subview1 = [[UIView alloc] initWithFrame:CGRectMake(0, 100, 300, 300)];
        _subview1.backgroundColor = [UIColor blueColor];
    }
    return _subview1;
}

- (UIView *)subview2 {
    if (!_subview2) {
        _subview2 = [[UIView alloc] initWithFrame:CGRectMake(50, 50, 200, 200)];
        _subview2.backgroundColor = [UIColor redColor];
    }
    return _subview2;
}

- (IBAction)buttonClick:(id)sender {
    UIButton *button = (UIButton *)sender;
    if (!button.isSelected) {
        self.subview1.frame = CGRectMake(0, 100, 400, 400);
        button.selected = YES;
    } else {
        self.subview1.frame = CGRectMake(0, 100, 300, 300);
        button.selected = NO;
    }  
}
@end

這里通過設(shè)置 self.subview2.autoresizingMask 的值去查看各種效果，使用過 autolayout 的朋友應(yīng)該都能秒上手了。

不為不會而恥，只因不學(xué)而愧，生命不息學(xué)習(xí)不止，偶爾打點小雞血^_ YHPopupView 歡迎各位star & fork，準(zhǔn)備這周出 PopupView 形式的自定義AlertView。